/*
 * Copyright 2019 WeBank
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.spark.sql.execution.datasources.csv

import org.apache.spark.sql.SparkSession

/**
  *
  */
object UDF extends Serializable{

  def listUDFs()(implicit spark: SparkSession): Unit =
    spark.sessionState.functionRegistry.listFunction().foreach(println)

  def existsUDF(name: String)(implicit spark: SparkSession): Boolean = {
    val list = spark.sessionState.functionRegistry.listFunction()
    if (null != list) {
      return list.map(_.toString).exists(name.equals(_))
    }
    false
  }
}
